Surface sizing agent emulsion and preparation method for same

A technology of surface sizing agent and emulsion, applied in the direction of adding water repellent, inorganic compound, non-polymer organic compound, etc., can solve the problem of large amount of sizing agent, and achieve the effect of improving hydrophobicity

Inactive Publication Date: 2013-11-27
SHANGHAI DONGSHENG NEW MATERIALS
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] Chinese patent CN200710150369.0 discloses a method for obtaining a sizing agent emulsion by

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  • Surface sizing agent emulsion and preparation method for same

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[0036] Example 1

[0037] Synthesis of cationic polymer:

[0038] a) Dissolve 0.3g potassium persulfate in 10g deionized water to form an aqueous initiator solution for use;

[0039] b) Add 100g of chitosan and 300g of deionized water into a 1000ml four-necked flask, dissolve, and raise the temperature to 60°C;

[0040] c) At 60°C, add 1g of hydrogen peroxide to a four-necked flask and keep it at 60°C for 1 hour; adjust the pH to 10.2 with 3g of sodium hydroxide.

[0041] d) Raise the temperature to 70°C again, quickly add 10g of 3-chloro-2-hydroxypropyltrimethylammonium chloride into a four-necked flask, keep at 70°C for 2 hours; neutralize with 1g of acetic acid to pH=3.05, then drop Add 0.5g of vinyl triisopropoxysilane and initiator solution, drip for 5 minutes, keep at 70℃ for 0.5 hour, add 0.5g of sodium methylene dinaphthalene sulfonate, keep at 70℃ for 0.5 hour, add 30.9g Deionized water was cooled to 25°C and filtered to obtain a cationic polymer: solid content by weight of 2...

Example Embodiment

[0046] Example 2

[0047] Synthesis of cationic polymer:

[0048] a) Dissolve 3 g of sodium persulfate in 10 g of deionized water to form an aqueous initiator solution. spare;

[0049] b) Add 100g of chitosan and 300g of deionized water into a 1000ml four-necked flask, dissolve, and raise the temperature to 70°C;

[0050] c) At 70°C, add 5g of hydrogen peroxide to a four-necked flask and keep it at 70°C for 3 hours; adjust the pH to 12.93 with 10g of sodium hydroxide.

[0051] d) Raise the temperature to 90℃ again, quickly add 30g of 2,3-epoxypropyltrimethylammonium chloride into a four-necked flask, keep at 90℃ for 5 hours; neutralize with 3g of acetic acid to pH=4.85, then add dropwise 5g γ-methacryloxypropyltrimethoxysilane and initiator solution, dripping time 15 minutes, keep at 90℃ for 1 hour, add 1g sodium methylene dimethanesulfonate, keep at 90℃ for 1 hour, Add 278g of deionized water, cool to 25°C and filter to obtain a cationic polymer: solid content by weight of 20.4wt%, ...

Example Embodiment

[0056] Example 3

[0057] Synthesis of cationic polymer:

[0058] a) Dissolve 2 g of ammonium persulfate in 10 g of deionized water to form an aqueous initiator solution. spare;

[0059] b) Add 100g of chitosan and 300g of deionized water into a 1000ml four-necked flask, dissolve, and raise the temperature to 65°C;

[0060] c) At 65°C, add 3g of hydrogen peroxide to a four-necked flask and keep it at 65°C for 2 hours; adjust pH=11.60 with 6g of sodium hydroxide.

[0061] d) Raise the temperature to 80℃ again, quickly add 20g 3-chloro-2-hydroxypropyltrimethylammonium chloride into a four-necked flask, keep at 80℃ for 3 hours; neutralize with 2g acetic acid to pH=4.08, and then drop Add 3g of vinyltriethoxysilane and initiator solution, drip for 10 minutes, keep at 80℃ for 0.8 hours, add 0.7g of sodium methylene dimethynaphthalene sulfonate, keep at 80℃ for 0.8 hours, add 138.5g to The ionized water was cooled to 25°C and filtered to obtain a cationic polymer: the weight solid content ...

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Abstract

The invention provides a preparation method for a surface sizing agent emulsion. The preparation method comprises the following steps: mixing a cationic polymer with water; adding molten AKD (alkyl ketene dimer) wax and paraffin wax at 70-75 DEG C; and then homogenizing in a condition of 10-25 Mpa, cooling to a temperature below 40 DEG C, and adding glyoxal, so as to obtain the surface sizing agent emulsion, wherein the cationic polymer is prepared by reacting a cationic etherifying agent, chitosan, hydrogen peroxide, silane, acetic acid, sodium hydroxide and a dispersing agent under the action of an initiator; the surface sizing agent emulsion comprises the following components in parts by weight: 80-90 parts of the AKD wax, 10-20 parts of the paraffin wax, 25-100 parts of the cationic polymer, 1-5 parts of glyoxal, and 270-600 parts of water, wherein the total of the AKD wax and the paraffin wax is 100 parts by weight. The surface sizing agent emulsion provided by the invention is a high-performance and environment-friendly product capable of meeting application for papermaking coatings; the product is capable of obviously improving the hydrophobicity of paper, reducing the Cobb value, and improving the surface strength of the paper in case of being applied to surface sizing for the paper.

Description

technical field [0001] The invention relates to a surface sizing agent emulsion, which is used for surface sizing in the paper production process. Background technique [0002] With the development of medium-alkaline papermaking technology, as a reactive medium-alkaline sizing agent, it has the characteristics of high sizing efficiency and low dosage, and has been widely used in papermaking. Traditional sizing agent emulsion uses cationic starch as emulsifier and stabilizer, but the retention rate of this emulsion on fiber is low, the reaction with fiber is slow, and the sizing curing time is long. In recent years, with the use of coated broken paper, deinked waste paper, and high-yield pulp, the improvement of the degree of closure of the white water cycle of the paper machine, and the use of other papermaking additives, the accumulation of disturbing anionic impurities in the wet end of the paper machine Concentrations are getting higher and higher, and they are more and ...

Claims

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Application Information

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IPC IPC(8): D21H21/16D21H17/60D21H17/06D21H17/66
Inventor 施晓旦尹东华王养臣
Owner SHANGHAI DONGSHENG NEW MATERIALS
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